Removing files that shouldn't have been staged

src/graphics/hello.png

@@ -1,6 +0,0 @@
-{
-  "text" : "Hello, world :)!",
-  "font" : "Liberation Sans",
-  "single-paragraph" : true,
-  "height" : 0
-}

src/graphics/hello.txt

@@ -1,7 +0,0 @@
-{
-  "text" : " Hello",
-  "font" : "FreeSans 32",
-  "single-paragraph" : true,
-  "alignment" : "center",
-  "height" : 0
-}